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Freuds body of work not only provides a basis von clinical practice, but is also often quoted in social sciences and social philosophy. I recently came across a text that references Freuds concept of Verneinung (Negation):

A supressed element of thoughts or imaginations can surface in the conscious mind under the condition it can be negated. Negation is away of acknowledging the supressed, actually a repeal of the supression, but of course not an acceptance [...] By way of negation only one consequence of the supression is undone, that the content of the supressed does not become conscious. The result is a kind of intellectual acceptance of the supressed, while the supression mostly persists.

Now my question is, is this aspect of negation testable (=falsifiable) in some way? What where results of such tests, if any? Absent tests that would satisfy a positivist, is there a body of experience from clinical practice that supports (or not) this theory of negation?

I'm aware that there's a lively debate about inhowfar psychoanalysis is science or pseudoscience. Much of psychoanalysis is not falsifiable, but this specific aspect may be.

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The correct translation of Verneinung in English is denial. Roy Baumeister, Karen Dale, and Kristin Sommer (2002) have reviewed empirical evidence for (or against) seven of Freud's defense mechanisms and have found that "denial [has] been amply shown in studies". You can read about the findings in detail in the article itself, which is currently avialable online here.

$\begingroup$Just to add, although Freud proposed denial as a defense mechanism and later work has backed that up, that doesn't mean that everything Freud has proposed regarding denial is true or supported by scientific evidence.$\endgroup$
– Bryan KrauseOct 22 '18 at 16:36